<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <!-- 引入Vue -->
  <script type="text/javascript" src="../js/vue.js"></script>
</head>

<body>
  <!-- 准备一个容器 -->
  <div id="root">
    <!-- info可以写成三目运算符 -->
    <h2>今天天气{{info}}</h2>
    <button @click="changeWeather">切换</button>
    <!-- @xxx="yyy" 绑定事件的时候可以写一些简单的语句 -->
    <!-- <button @click="isHot=!isHot">切换</button> -->
  </div>
</body>
<script type="text/javascript">
  Vue.config.productionTip = false; //阻止vue在启动时产生产提示

  let vm = new Vue({
    el: '#root',
    data: {
      isHot: true
    },
    computed: {
      info () {
        return this.isHot ? '炎热' : '凉爽'
      }
    },
    methods: {
      changeWeather () {
        this.isHot = !this.isHot
      }
    },
  })
</script>

</html>